TGS 203 - Carbon Monoxide Sensor Specifications - Meditronik

TECHNICAL INFORMATION FOR TGS2034-3 Durability of the activated charcoal filter(1) Effect of storage in normal airIn Figure 18, the effect of NO2 on a sensor stored for3.5 years in normal air and a new sensor with a newfilter are plotted. Virtually no difference in the abilityof the sensor to eliminate the effects of NO2 can beseen between the two samples.Rs (CO 100ppm + NO2 50ppm)Rs (CO 100ppm)1.151.101.051.000.95Max.Ave.Min.NewAfter storagefor 3.5 yearsFigure 18 - Effect of being stored in normal air(2) Effect of high temperature and high humidity1.15In Figure 19, the effect of NO2 is plotted for a sensorstored for two months under conditions of 50˚C and90%RH and for a new sensor with a new filter. Thisfigure demonstrates that high temperature andhumidity have almost no effect on the activatedcharcoal filter’s ability to eliminate the effects of NO2.Rs (CO 100ppm + NO2 50ppm)Rs (CO 100ppm)1.101.051.000.95Max.Ave.Min.NewAfter storagefor 2 monthsin 50˚C/90%RHFigure 19 - Effect of high temperature/humidity(3) Effect of long-term energizingIn Figure 20, the filter’s performance in eliminatingthe effects of NO2 and alcohol vapor is compared forthree different types of samples:* new filter* filter used on sensor energized for one year* filter used on a sensor energized for 7 yearsThese sample filters were placed on new sensorelements for conducting this test. The results showthat as the energizing period becomes longer,performance in removing NO2 and alcohol vaportends to decrease. However, the level of degradationin this performance is minimal and does not reach alevel which would be a problem in practical usage.Rs/Rs(CO 100 ppm)Rs/Ro (CO 100ppm)1000100101C2H5OH 1000 ppmCO 100 ppm + NO2 50 ppmNew 1 year old 7 years old oldFigure 20 - Effect of long-term energizingRevised 9/99 12/14